Google is obviously increasing it's coverage for its filters.
In the real estate field it used to be only "city real estate" and "city real estate + any term" that were filtered with Austin this has increased to "city homes" and "city homes + any term".
Other terms are not being filtered and SEO is same old same old. I am not too worried. I figure Google will just go filter overboard and users will start using MSN.
For those who wonder how do they know which sites to filter. It's actually fairly easy. Directories and commercial sites look very different. Directories generally link out to many relevant sites where as commercial sites generally avoid linking heavily to direct competitors. Linking out in a directory is spead throughout where as commercial sites place out going links prodominately on a links page. The new ranking system seems to based more on the quality of the directory's links than the quality of the content. Annoyingly this means a lot of the top sites are just directories where my sites are listed. We have seen the end of content is king and it has been replaced by linking to content is king sites.
I imagine the future is bleak for those who do not adapt and switch to a directory style site. I have tested the theory and recovered rankings. Personally, I feel like it discourages developing content.